Abstract
The dimethyl complex Cp*(η4-C4H6)NbMe2 (2) was found to be thermally unstable, and its thermolysis generated a nascent methylidene species that was trapped by carbonyl compounds, giving olefinic products. Addition of norbornene and acenaphthylene to the carbene species gave rise to metallacyclobutane derivatives Cp*(η4-C4H6) Nb[CH2CH(C5H8)CH] (4) and Cp*(η4-C4H6) Nb[CH2CH(C10H6)CH] (8), respectively. The structure of 4 was determined by X-ray analysis. Complex 4 was found to be a catalyst for the ROMP of norbornene.
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